몬테로톤도 마리티모‬에서 가장 멋진 ‪18‬개의 천연기념물

the path is not marked but it is a little rough but it is worth reaching

The Buca delle Fate, a natural ravine between the rocks on the slopes of Poggio di Montieri, is a medieval tunnel opened in the Jaspers (red siliceous rock) in correspondence with a fracture with a N20° direction which would have facilitated its excavation. The tunnel has a significant slope (25°) and is very short, about 14 metres; in its terminal part there is a 2x1.5m well currently closed by debris. In the deepest part of the tunnel, in the vault of the well, modest traces of newly formed minerals were found consisting of crystalline concretions of calcite (calcium carbonate), spangolite (hydrated chlorine sulphate of copper and aluminum), nantokite (copper chloride) and brushite (hydrated calcium phosphate). At the top of the well you can observe quadrangular recesses and indentations dug into the rock which were used to anchor the support beams of the winch. Since the tunnel is very narrow (50cm on average) it has two exchange niches along its path, useful for allowing the transit of two miners. Other small rooms used to place lamps are also visible. The absence of evidence of mineralization and an external mining dump makes it implausible that this is a mining tunnel. It is reasonable to hypothesize that this work was functional to the vast underlying excavations, identified in the Santa Maria dei Castagni tunnel between the 19th and 20th centuries. and therefore used as a secondary access route to mining works or as a ventilation duct.

Dante's True Inferno

The Biancane Natural Park where geothermal energy releases its vapors from the subsoil is a fascinating place to visit both on foot and by MTB, offering various routes for all levels.

Superb Viewpoint

The route is worthwhile if done in a loop from Monterotondo to Sasso Pisano and back. Suggestive smokers and small gaisers. Also suitable for children. The path is never dangerous.

The Biancane nature park is a natural area near the center of Monterotondo Marittimo where the characteristic "biancane" are located, which represent one of the many sites where geothermal energy strongly characterizes the landscape on the border between the provinces of Pisa and Grosseto . Source: https://it.wikipedia.org/wiki/Parco_naturalistico_delle_Biancane

Ring up to Sasso Pisano and return to Monterotondo to make the ring.